Lamborghini Huracan Actuator Right 4T0501398B

the part number 4T0501398B identifies the Right Rear Wheel Steering Actuator for the Lamborghini Huracán.

This component is essential for the LAWS (Lamborghini All-Wheel Steering) system found on the Huracán EVO, STO, and Tecnica models. It physically adjusts the toe angle of the right rear wheel to improve low-speed agility and high-speed stability.

1. Technical Identification

• Part Number: 4T0501398B (Right Side)

• Associated Left Side: 4T0501397B

• Component Type: Electromechanical Linear Actuator.

• Function: It receives signals from the LDVI (Lamborghini Dinamica Veicolo Integrata) central “brain.” At low speeds, it turns the wheel in the opposite direction of the front wheels to reduce the turning circle; at high speeds, it turns in the same direction to stabilize the car during lane changes.

2. 2026 Market Pricing (Estimated USD)

These actuators are high-precision electronic parts. Because they are safety-critical (steering), they are rarely repaired and almost always replaced as a unit.

3. Common 2026 Issues & Symptoms

By 2026, older EVO models are seeing specific failures in these units:

• “Rear Steering Service Required” Warning: Often caused by an internal sensor failure or moisture ingress in the electrical connector.

• Mechanical Binding: A “grinding” noise during tight parking maneuvers, indicating the internal screw drive is worn.

• Calibration Drift: The car may feel “crab-walked” or slightly pulled to one side at highway speeds if the actuator fails to return to the perfectly neutral (zero) position.

4. Installation & Programming

• Calibration: You cannot simply bolt this part on and drive. After installation, the car requires a Neutral Position Calibration using the Lamborghini LaRA or ODIS diagnostic system. This tells the car exactly where the “center” is for that specific actuator.

• Alignment: A full 4-wheel alignment is mandatory after replacement. If the rear steering is even $0.1^\circ$ off-center, it will drastically affect tire wear and the ESC (Electronic Stability Control) performance.

• Hardware: It is recommended to replace the mounting bolts and the tie-rod end associated with the actuator if they show any signs of corrosion or play.